You might consider it an arbitrary definition. However, it is one that makes sense. Look at this sequence:
10 to the power 3 = 1000
10 to the power 2 = 100
10 to the power 1 = 10
10 to the power 0 = ???
10 to the power -1 = ???
10 to thepower -2 = ???
What number would you logically place there? Look at the two sequences - the exponents get reduce by 1 at a time, and the result gets reduced by a factor of 10 every time. If you logically continue this, you get the result that 10 to the power 0 is 1, and you also get reasonable expressions for negative powers.
More formally, certain rules of exponents will continue being valid when powers are defined this way; in this case, mainly, (x to the power a) times (x to the power b) = x to the power (a + b). This continues to be valid ONLY if x to the power zero is defined as 1.
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The value of any nonzero number raised to the zero power will equal positive one (1).
1.1 x 10^0 (That's ten to the zero power). Any nonzero real number, raised to the zero power equals 1.
Any number raised to the power 0 equals 1.
It is always 1
== == The fact is - any nonzero number raised to 0 is always 1. the reason is: suppose a is nonzero. Then by the quotient rule of indices, am/an = am - n Taking m = n we come up with am - m = am/am , which is 1 in view of a nonzero.